<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      :root {
        --main-color: #4285f4;
        --button-color: #ccc;
      }

      body {
        background-color: var(--main-color);
        width: 100%;
        height: 500px;
        display: flex;
        justify-content: space-around;
        align-items: center;
      }

      .button {
        background-color: var(--button-color);
        color: white;
        padding: 10px 20px;
        border-radius: 5px;
      }
    </style>
  </head>

  <body>
    <div class="button">123</div>
  </body>
</html>
